Preparing Your Tanks for Probes
Figure 7-1 Underground Tank Manholes
1.13 Underground Tank Manholes
1. Excavate a 50 cm (20 in) minimum diameter manhole around an unused fitting in the top of the tank.
The hole must be big enough for a weatherproof junction box. If this fitting is not in the center of the tank,
you must take additional measurements for probe compensation (refer to Section 8, Product Float and
Water Float Offsets).
2. Install a 7.5 cm – 10 cm (3 in – 4 in) diameter riser pipe in the fitting. This pipe must be long enough to
accommodate the probe head, and it must be large enough to accommodate the probe head, and it
must be large enough to accommodate the probe floats. 5 cm and 10 cm (2 in and 4 in) floats are
available.
3. Install a weatherproof junction box with 13 mm (0.5 in) knockouts near the riser pipe. The junction box
must be close to the riser to allow probe cable to reach.
4. Install a 13 mm (0.5 in) busing in the junction box.
5. Install an adapter collar onto the tank’s riser pipe.
NOTE: Use a riser cap with a suitable cable bushing installed. For older Model 924 and 613 probes, use a
bushing with an inner diameter of 11 mm (0.44 in). For next-generation 924, use bushings with an inner
diameter of 5 mm (0.19 in).
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